US PATENT SUBCLASS 423 / 526
.~.~.~.~.~ Utilizing pressure or vacuum on mixture

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

511  DF  SULFUR OR COMPOUND THEREOF {4}
512.1  DF  .~ Oxygen containing {11}
521  DF  .~.~ Ternary compound containing hydrogen {1}
522  DF  .~.~.~ Sulfuric acid {5}
525  DF  .~.~.~.~ Starting material includes organic or carbonaceous impurity {3}
526.~.~.~.~.~ Utilizing pressure or vacuum on mixture

DEFINITION

Classification: 423/526

(under subclass 525) Processes wherein the pressure on the mixture of acid and impurities is caused to be increased to greater than atmospheric or is caused to be decreased below atmospheric.

(1) Note. These processes necessitate use of an autoclave or enclosed chamber. If the mixture is merely contacted with a gas which is then free to expand classification is in subclass 528 below.